Other forms: seatings
The noun seating means the available seats in a room or area, so a theater could have seating for 100. Seating is also the action of helping people find their seats, or the specified time when people sit down.
If the first seating for dinner happens at six and the second at eight, it means that the dinner will be served in two sections, with half the guests sitting down to eat at each seating. And when a sports arena has special seating for disabled fans, it means that there are seats accommodating people who use wheelchairs or are otherwise affected by a disability.